Turning corpses into a resource
In BioShock, the material the Little Sisters collect is called ADAM: a substance that lets people alter their bodies and gain extraordinary abilities. Its source is a sea slug whose biological processes produce ADAM. The slugs are implanted in the girls, and the girls are made to harvest it from the dead—using a tool to draw material from corpses rather than simply gathering scraps from the streets.
That setup gives Rapture’s collapse a grimly practical afterlife. A corpse is not only evidence of violence; it is also a store of a valuable substance. The Little Sisters’ work helps explain how ADAM remains available in the ruined city, even as the people who created its demand are gone.
A resource loop the player must confront
ADAM powers the genetic modifications that make Rapture’s residents—and the player—more capable. That creates a tight loop: people want ADAM to become stronger, and the dead become a source of more ADAM. The children are trapped inside that system, while the hulking Big Daddies guard them as they work.
This is also why the harvesting is more than grisly scenery. The player can intervene, and the game makes the fate of a Little Sister part of the decision about gaining ADAM. The same substance that fuels the player’s upgrades is tied to the exploitation of a child, turning Rapture’s resource economy into a personal moral choice rather than distant background lore.
